Question: Write the system of equations, and solve for x, y, and z by any method:

How do the Quarter Pounder and Whopper With Cheese measure up in the calorie department? Two Quarter Pounders and three Whoppers With Cheese provide 2607 calories. Even one of each provides 9 calories more than what is allowed on a 1000 calorie a day diet. Find the calories in each item. [You must show the system of equations and your work to receive credit].